EE2403 Special Electrical Machines - Important Questions - Gokul Edition

[GOKULAKRISHNAN R]

Anna University

Department of Electrical and Electronics Engineering

SUBJECT CODE & NAME: EE 2403 – SPECIAL ELECTRICAL MACHINES

YEAR / SEM: IV / VII

 

UNIT – I

SYNCHRONOUS RELUCTANCE MOTOR

1. Explain the constructions and working principle of synchronous reluctance motor. (16)
2. Explain in detail about classification of synchronous reluctance motor. (16)
3. Draw the phasor diagram of synchronous reluctance motor. (16)
4. Derive the torque equation of synchronous reluctance motor. (16)
5. Draw and explain the characteristics of synchronous reluctance motor. (16)
6. Explain in detail about vernier motor. (16)
 

UNIT – II

STEPPER MOTOR

1. Explain the construction and various modes of excitation of VR stepper motor. (16)
2. Explain the construction and various modes of excitation of PM stepper motor. (16)
3. Explain the construction and working principle of Hybrid Stepper motor. (16)
4. State and explain the static and dynamic characteristics of a stepper motor. (16)
5. Explain in detail about different types of power drive circuits for stepper motor. (16)
6. Explain the mechanism of torque production in VR stepper motor. (16)
7. Draw any two drive circuits for stepper motor. (16)
 

UNIT – III

SWITCHED RELUCTANCE MOTOR

1. Explain the construction and working principle of switched reluctance motor. (16)
2. Describe the various power controller circuits applicable to switched reluctance motor and explain the operation of any one scheme with suitable circuit diagram. (16)
3. Draw a schematic diagram and explain the operation of a ‘C’ dump converter used for the control of SRM. (16)
4. Derive the torque equation of SRM. (16)
5. Draw and explain the general torque-speed characteristics of SRM and discuss the type of control strategy used for different regions of the curve. Sketch the typical phase current waveforms of low speed operation. (16)
6. Describe the hysterisis type and PWM type current regulator for one phase of a SRM (16)
 

 

 

 

UNIT – IV

PERMANENT MAGNET BRSHLESS DC MOTOR

1. Sketch the structure of controller for PMBLDC motor and explain the functions of various blocks. (16)
2. Explain the closed loop control scheme of a permanent magnet brushless dc motor drive with a suitable schematic diagram. (16)
3. Drive the expressions for the emf and torque of a PMBLDC motor. (16)
4. Draw the diagram of electronic Commutator. Explain the operation of electronic Commutator. (16)
5. Discuss the use of Hall sensors for position sensing in PMBLDC motor. (16)
6. Sketch the torque-speed characteristics of a PMBLDC motor. (16)
 

UNIT – V

PERMANENT MAGNET SYNCHRONOUS MOTOR

1. Explain the construction and operation of PMSM. (16)
2. Explain the principle of operation of a sine wave PM synchronous machine in detail. Draw its phasor diagram and derive its torque equation. (16)
3. Derive the emf equation of PMSM. (16)
4. Write about Self control of PMSM. (16)
5. Derive the expressions for power input and torque of a PMSM. Explain how its torque speed characteristics are obtained. (16)
6. Explain in detail the vector control of permanent magnet synchronous motor. (16)

[Srini]

Good Start bro,..... +1